Toyota 2013 Prius Owner's Manual page 140

Operation signals
■
A buzzer sounds and the emergency flashers flash to indicate that the doors
have been locked/unlocked. (Locked: Once; Unlocked: Twice)
When the door cannot be locked by the lock sensor on the upper part
■
of the door handle
PRIUS PHV_OM_OM47787U_(U)
1-4. Opening, closing and locking the doors
If the door will not lock even when the
topside sensor area is touched, try touch-
ing both the topside and underside sen-
sor areas at the same time.
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